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American Journal of Clinical Nutrition, Vol 47, 298-304, Copyright © 1988 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Total parenteral nutrition in the newborn: impact of the quality of infused energy on nitrogen metabolism

M Pineault, P Chessex, S Bisaillon and G Brisson
Perinatal Service Hopital Ste-Justine, Montreal, Canada.

To separate the respective influence of the level and source of infused energy on nitrogen metabolism, 32 studies were performed in 16 appropriate-for-gestational-age newborn infants (birth weight 2150 +/- 115 g, means +/- SEM). In a cross-over design, each patient received two 6-d periods of isocaloric and isonitrogenous (450 mg.kg-1.d-1) infusions, differing only by the source of calories (high or low fat intakes). Half of the patients were studied at 60 kcal.kg-1.d-1, the other half at 80 kcal.kg-1.d-1. Nitrogen balance, urinary 3- methylhistidine excretion, glycemia, and insulin were compared. The results suggest that for an intravenous energy intake ranging from 60 to 80 kcal.kg-1.d-1, glucose and fat provide an equivalent nitrogen sparing effect in the newborn infant. At an energy level covering maintenance requirements, it is the infant's clinical condition rather than the source of energy which affects most the magnitude of amino acids participation in energy metabolism.


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